#!/usr/bin/env python
# coding=utf-8


def except01():
    while 1:
        print "this is a division program."
        c = raw_input("input 'c' continue, otherwise logout:")
        if c == 'c':
            a = raw_input("first number:")
            b = raw_input("second number:")
            try:
                print float(a) / float(b)
                print "*************************"
            except ZeroDivisionError:
                print "The second number can't be zero!"
                print "*************************"
            except ValueError:
                print "please input number."
                print "************************"
            finally:
                print "finish it"
        else:
            break


if __name__ == '__main__':
    except01()
